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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb2f221d98fbb18a627d59d9e710529b1fa1d9406e45f5969f367e1c4fcaa7e' 
  AND token = 'WaTbuq0Wy+b7gmJmiXVfzuDNpS3AcyNlFzlL5b652Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}